/Engine/Plugins/FX/Niagara/Source/Niagara/Public/NiagaraUserRedirectionParameterStore.h
Extension of the base parameter store to allow the user in the editor to use variable names without the "User." namespace prefix. The names without the prefix just redirect to the original variables, it is just done for better usability.
[USTRUCT](Programming/UnrealArchitecture/Reference/Structs)() struct FNiagaraUserRedirectionParameterStore : public [FNiagaraParameterStore](API\Plugins\Niagara\FNiagaraParameterStore)